Dahua Technology NVR41 Series, User Manual, Page: 47 / 355

Front Panel and Rear Panel 35
Name Function
1
～
16
Alarm input port
1
～
16

There are four groups. The first group is from
port 1 to port 4, the second group is from port 5
to port 8, the third group is from 9 to 12, and the
fourth group is from 13 to 16. They are to receive
the signal from the external alarm source. There
are two types; NO (normal open)/NC (normal
close).

When your alarm input device is using external
power, please make sure the device and the
NVR have the same ground.
Ground Alarm input ground end.
NO1
～
NO5 Alarm output port
1
～
5

5 groups of alarm output ports. (Group 1:port
NO1
～
C1,Group 2:port NO2
～
C2,Group 3:port
NO3
～
C3, Group 4:port NO4
～
C4, Group 5: port
NO5, C5, NC5).Output alarm signal to the alarm
device. Please make sure there is power to the
external alarm device.

NO: Normal open alarm output port.

C: Alarm output public end.

NC: Normal close alarm output port.
C1
～
C5
NC5
A
RS-485
communication
port
RS485_A port. It is the cable A. You can connect to
the control devices such as speed dome PTZ.
B RS485_B.It is the cable B. You can connect to the
control devices such as speed dome PTZ.
CTRL 12V / Controller 12V power output. It is to control the on-off
alarm relay output. It can be used to control the
device alarm output. At the same time, it can also be
used as the power input source of some devices such
as the alarm detector.
+12V /
+12V power output port. It can provide the power to
some peripheral devices such as the camera or the
alarm device. Please note the supplying power shall
be below 1A.
RS-232 RS232 debug
COM.
It is for general COM debug to configure IP address
or transfer transparent COM data.
VGA
VGA video output
port
VGA video output port. Output analog video signal. It
can connect to the monitor to view analog video.
PoE PORTS /
Bult-in Switch. Support PoE or ePoE function.

For ePoE series product, port 1 to port 8 are the
ePoE ports. ePoE port supports 300
meters@100Mbps, 800 meters@10Mbps. Port 9
to port 16 are general PoE ports.

The 16 PoE series product supports total 150W.
2.2.11 NVR48/48-16P Series